Upgrades 3/4

What do upgrades 3/4 do exactly? I find their wording pretty vague, and no one I've talked to in game seems to know, either.
Terracotta Army wrote:96 territory map > You have 65 territories = 50 units (+ up to 10% of 96 (max.10 units)) + 8 = 58
Terracotta Army wrote:On an XXL map there are 96 tiles with max. units of (up to 10% of total map size) 9.6 (9) for upgrades 3 & 4 = 58.
Ratburntro44 wrote:No, it gets to 49 from third upgrade. Both upgrades add same amount. 40+9+9=58.